Newton's contribution to physics: MCQ with Answer and Explanation

Question
Newton's contribution to physics:
A. Theory of relativity
B. Laws of motion and gravitation
C. Quantum mechanics
D. Electromagnetic theory
Answer: Option B
Solution (By JKSSB Mock Tests)
Isaac Newton: three laws of motion, universal gravitation, calculus, optics. Relativity: Einstein; EM theory: Maxwell; Quantum: Planck/Bohr. Memory tip: 'Newton = classical mechanics foundation'. Scientist-discovery association frequently tested in competitive exams.
This question belongs to: Science Physics
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Practice More Physics Questions

Question #1
Which of the following particles has the largest penetrating power?
A. Beta particles
B. Gamma rays
C. Protons
D. Alpha particles
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Correct Answer: Option B

Explanation:
Gamma rays (photons) have highest penetration, stopped by thick lead/concrete. Alpha least (paper/skin). Beta intermediate (aluminium). Neutrons also penetrating but not listed. Gamma has no charge.
This question belongs to: Science Physics
Question #2
The device used to measure the speed of a vehicle is
A. Odometer
B. Barometer
C. Speedometer
D. Anemometer
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Correct Answer: Option C

Explanation:
Speedometer measures instantaneous speed of vehicle. Odometer measures distance travelled. Anemometer wind speed. Barometer pressure.
This question belongs to: Science Physics
Question #3
A piece of ice of density 0.9 g/cm³ floats in water. Fraction of volume above water is
A. 0.9
B. 0.1
C. 0.5
D. 0.2
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Correct Answer: Option B

Explanation:
Submerged fraction = ρ_ice/ρ_water = 0.9, above = 0.1 (10%).
This question belongs to: Science Physics
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